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Thread: Calculating pump rate

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    Join Date
    Mar 2013
    Location
    NW GA
    Posts
    69

    Calculating pump rate

    I have a 2.7hp variable rate pump/timer by AO Smith. Side label attached
    Any idea how to calculate pump flow so I can determine run time and rate?

    I know the swg needs 2175rpm (25% max flow) to operate.
    I know the swg needs 2700rpm (55% max flow) to operate while the Kreepy Krawly vacuum is in the pool.

    Help?
    TIA!
    Attached Images Attached Images
    26900 gal IG Vinyl (18'x36', 3' shallow end and 8' deep end plus steps)
    sand filter and 2.7hp variable speed timer
    Jandy Ei SWG (2yr old)

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    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,482

    Re: Calculating pump rate

    Flow rate is determined primarily by the following:

    Plumbing setup - Pipe lengths, fittings, equipment, etc.
    Pump wet end - What is the motor attached to?
    Motor speed

    But required run time for a pool doesn't really depend so much on flow rate. The simple solution is to run the pump long enough to keep the pool clean and chlorinated.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

  3. Back To Top    #3

    Join Date
    Mar 2013
    Location
    NW GA
    Posts
    69

    Re: Calculating pump rate

    Ha. Thank you.
    That's not specific enough I'm not a fan of trial and error. LoL especially if (a) I error or if (b) I waste time/money on starting too high.
    Thank you for your response!
    I guess I'll start it at the min speed 12 hours a day and see from there.
    26900 gal IG Vinyl (18'x36', 3' shallow end and 8' deep end plus steps)
    sand filter and 2.7hp variable speed timer
    Jandy Ei SWG (2yr old)

  4. Back To Top    #4
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: Calculating pump rate

    The simplest answer may be to invest $150 or so in a good flow meter and plumb it into your pad, then you will know what is going on and you will not have to guess.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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